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Based on the second virial coefficient(A2)to Study Effect of the Synergistic Action of Solvent and External Electric Field on the Solution Behavior and Film's Condensed State Structure

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Chinese Journal of Polymer Science 2022年第5期40卷 478-490页

作者： Ya-Nan Guo Hao Zhang Bin Liu Dan Lu State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

The solventnatures are crucial to deeply reveal solution behavior of macromolecular chains,physical essence of condensed state structures formation of the film as well as the photoelectronic devices *** on the second virial coefficient(A2),effect of the synergistic action of solvents and external electric field on both solution behavior and the film’s condensed state structure for the semi-rigid conjugated polymer,poly[2-methoxy-5-(2’-ethylhexoxy)-1,4-phenylvinylene](MEH-PPV)was investigated by dynamic/static light scattering,photoluminescence spectroscopy and transmission electron microscopy,*** was found that although the MEH-PPV solutions with different solvents(toluene,chlorobenzene,chloroform and tetrahydrofuran)all could generate a response to the external electric field,the degree of response varied significantly with the change of solvent ***,ordered degree of the film from the solutions was also obviously *** essential reason for this responsive difference was firstly revealed in the research,which actually depended on the degree of interaction between the solute and solvent,and this degree of interaction could be quantitatively described by the second virial coefficient(A2).The bigger the A2,the stronger the interaction between solvent and solute in the solution,and the stronger the response to the external electric ***,under the induction of external electric field,chains aggregations with different sizes were formed accompanied by large-scale chains ordered structure in the *** ordered structure not only can effectively transfer to film prepared by the precursor solution but also is beneficial to enhance the carrier mobility and device efficiency of the photoelectronic film.

关键词： Semi-rigid conjugated polymer External electric field second virial coefficient Solution behavior Condensed state structure

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The scaling behavior of the second virial coefficient of linear and ring polymer

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Science China Chemistry 2016年第5期59卷 619-623页

作者： Bing Li Zhaoyan Sun Lijia An Zhen-Gang Wang State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100039China Division of Chemistry and Chemical Engineering California Institute of TechnologyCalifornia 91125USA

The scaling behavior of the second virial coefficient of ring polymers at the theta temperature of the corresponding linear polymer(θ_L) is investigated by off-lattice Monte Carlo simulations. The effects of the solvents are modeled by pairwise interaction between polymer monomers in this approach. Using the umbrella sampling, we calculate the effective potential U(r) between two ring polymers as well as the second virial coefficient A_2 of ring polymers at θ_L, which results from a combination of 3-body interactions and topological constraints. The trend in the strength of the effective potential with respect to chain length shows a non-monotonic behavior, differently from that caused only by topological constraints. Our simulation suggests that there are three regimes about the scaling behavior of A_2 of ring polymers at θ_L: 3-body interactions dominating regime, the crossover regime, and the topological constraints dominating regime.

关键词： second virial coefficient topological constraints 3-body interactions theta temperature scaling behavior

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The Potential Function for Double Square-Well Model and Its Application to Calculation of the second virial coefficient

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Journal of Thermal Science 1993年第3期2卷 165-169页

作者： TongJingshan GaoGuanghua 等 ChemicalEngineeringDepartment TsinghuaUniversityBeijingChina ChemicalEngineeringDepartment Tsinghua

In the present paper,the mechanism of molecular aggregation and the character of potential function for square-well model have been investigated with the principle of molecular thermodynamics,leading to the potential function for double square-well(DSW) model,In addition,the equation of second virial coefficient for DSW model is derived from the statistical mechanics *** above equation obtained has been verified by tests and the test results are *** is concluded that this equation can well represent the behaviour of fluid molecules.

关键词： potential function molecular aggregation second virial coefficient

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STUDY ON THE CONCENTRATION EFFECTS IN GPC IV A NEW METHOD FOR DETERMINATION OF second virial coefficientS FROM THE CONCENTRATION EFFECTS

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Chinese Journal of Polymer Science 1991年第2期9卷 151-159页

作者：胡桂贤宋名实 Department of Polymer Science Beijing Institute of Chemical Technology Beijing

In this paper a new relation between the second virial coefficients A_2, (?)_w and (dV_(es)/dC)_c→0=K_s was derived from proposed model theory of concentration effects in GPC for mono-and poly-dispersed polymers. Based on this relation a new method for determination of second vifial coefficients from the combination of (dV_(es)/dC)_c→0=K_3, (?)_w and K_H measurements was *** values of A_2 for mono-and poly-dispersed polystyrenes with molecular weight range from 10~4 to 10~6 in good and theta solvents were determined by proposed method. Results show that their values of A_2 are in agreement with those obtained by light scattering.

关键词： Polymer solution second virial coefficient GPC.

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Study of CH_(4)and CO_(2)competitive adsorption on shale in Yibin,Sichuan Province of China

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Carbon Resources Conversion 2019年第1期2卷 35-42页

作者： Yue Ma Changtao Yue Shuyuan Li Xinyi Xu Yue Niu State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China

Shale gas is an unconventional gas source with substantial development *** this study,Longmaxi Formation shale from the Silurian system in Yibin,Sichuan Province was collected for characterizing total organic carbon(TOC),clay mineral content,and other reservoir *** pore structure of shale was analyzed by field-emission scanning electron microscopy and low-temperature N_(2) adsorption–desorption *** adsorption experiments for CH_(4)and CO_(2)mixtures in shale samples were *** second virial coefficient was used to calculate for the compressibility factor of the gas *** influencing factors of gas adsorption capacity of shale were ***,the CH_(4)and CO_(2)adsorption capacities and selection of shale samples were *** low pressure,the total gas mixture capacity of shale samples was positively correlated with *** the pressure increased to a certain extent,the growth trend of gas mixture adsorption capacity of shale samples *** mixed gas adsorption volume is high at 50℃ for all the *** the same temperature and pressure,the CO_(2)adsorption of shale samples is higher than the CH_(4)*** competitive adsorption,shale prefers to adsorb CO_(2).Therefore,CO_(2)is easier to be adsorbed by shale and this causes CH_(4)to be released from the adsorption site.

关键词： CH_(4) CO_(2) Competitive adsorption second virial coefficient

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Speed of Sound and Ideal-Gas Heat Capacity at Constant Pressure for HFC-125

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Tsinghua Science and Technology 2001年第5期6卷 479-483页

作者：张昌段远源王鑫朱明善 Departmen of Mechanical Engineering Wuhan Institute of Science and Technojogy Wuhan 430073 China Department of Thermal Engineering Tsinghua University Beijing 100084 China

The gaseous speed of sound, the ideal gas heat capacity at constant pressure, and the second virial coefficient were determined for pentafluoroethane (HFC 125). A total of 49 data points of speed of sound for gaseous HFC 125 were measured for temperatures from 273 to 313 K and pressures from 32 to 479 kPa with a cylindrical, variable path acoustic interferometer. The ideal gas heat capacity at constant pressure and the second acoustic virial coefficient were determined over the temperature range from the speed of sound measurements and were correlated as functions of temperature. An analytical expression for the second virial coefficient derived using the square well intermolecular potential model was compared with the data.

关键词： pentafluoroethane (HFC 125) speed of sound ideal gas heat capacity at constant pressure second virial coefficient

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